code: def start_cmd(cmd, blocking=True):
      print(cmd)
      return (
          check_call(
              cmd,
              stdout=sys.__stdout__,
              stderr=open("spanning_tree_error.out", "a+"),
              shell=True,
          )
          if blocking
          else Popen(
              cmd,
              stdout=sys.__stdout__,
              stderr=open("spanning_tree_error.out", "a+"),
              shell=True,
          )
      )
  
file_path: ipyparallel/benchmarks/profiling/profiling_code_runner.py
imports: import datetime
  import os
  import sys
  import time
  from subprocess import Popen, check_call, check_output
  import ipyparallel
label_desc: Use image node_id 3 for calling a global function with example usage: start_cmd(cmd, blocking) and returns: unknown